Properties Tab (version >= 15.12)

In kdenlive version 15.12 the effect stack is merged with the "Transition" Tab to create a "Properties" window/tab.

The Properties window displays the settings for the effects on the currently selected clip (Figure 1) or the settings for the currently selected transition (Figure 2) depending on whether it is a clip or a transition that is currently selected.

Figure 1 - Properties when a clip with effects is selected

Figure 2 - Properties when a transition is selected

If you select the transition in the timeline its properties will appear in the Properties tab (Figure 2).

You should preview your transition to make sure it is running in the direction you expect. For example, if it is a Dissolve transition and it is running in the correct direction, then the first clip should dissolve into the second clip. But if it is in the wrong direction, the first clip will suddenly disappear (replaced by the second track). It will then fade back in and abruptly jump to second clip. If your transition is in the wrong direction, just select the Reverse check box in the Properties tab.

Transition Tab (pre version 15.12)

If you select the transition in the timeline its properties will appear in the Transition tab.

If the Transition dialog is not visible, use View -> Transition to add it.

You should preview your transition to make sure it is running in the direction you expect. For example, if it is a Dissolve transition and it is running in the correct direction, then the first clip should dissolve into the second clip. But if it is in the wrong direction, the first clip will suddenly disappear (replaced by the second track). It will then fade back in and abruptly jump to second clip. If your transition is in the wrong direction, just select the Reverse check box in the Transition tab.

How to create transitions with a single click

There is a shortcut for creating transitions between two tracks that overlap.

In Version 17.04 you hover the mouse over the lower grey rectangle that appears at the end of the clips on the timeline and a tool tip will appear saying "Click to add Transition". If you click a dissolve transition will be automatically added.

Older Versions:
If you hover the mouse over the overlapping region on the timeline, a green triangle will appear. Clicking this adds a dissolve transition between the tracks.

Automatic Transitions

If a transition is set as an "Automatic Transition" and you adjust the overlap between the two clips involved in the transition, then the length of the transition will automatically adjust to cover the region where the clips overlap.

You can toggle off this feature on a transition by selecting the transition and choosing Automatic Transition from the Clip menu.